$ git diff-tree --pretty --root --summary initial
commit 444ac553ac7612cc88969031b02b3767fb8a353a
Author: A U Thor <author@example.com>
Date:   Mon Jun 26 00:00:00 2006 +0000

    Initial

 create mode 100644 dir/sub
 create mode 100644 file0
 create mode 100644 file2
$
